630 - Agriculture 2,014 查看记录 610 - Medicine & health 1,624 查看记录 640 - Home & family management 1,316 查看记录 650 - Management & public relations 1,011 查看记录 620 - Engineering 388 查看记录 660 - Chemical engineering 293 查看记录 690 - Building & construction 65 查看记录 600 - Technology 56 查看记录 680 - Manufacture for specific uses 44 查看记录 670 - Manufacturing 30 查看记录